Are local time signature independent time signatures?
If yes, no nothing special in this project.
Local barlines?
I don’t know what it is, then I probably do not have some 
No, these are all MA frames each including all flows.
What I do have is at the moment in one song several frames on a page as I showed in the second post of this thread:
Out of curiosity could you point me to the “known limitations” you mention?